Directive emission from high-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Q</mml:mi></mml:math>photonic crystal cavities through band folding

Abstract

We propose a design methodology for high-$Q$ photonic crystal nanocavities with a tailored radiation pattern. As an example, we applied this technique to five missing hole defect cavities and experimentally achieved a sixfold improvement of the collection efficiency. This will enable high external efficiency in single-photon sources based on photonic crystal nanocavities.